Perhaps you should try some spelling variations:
thien van » thi van
hanh di » hanh vi, hanh de, hang di
van cam » van nam, van lam, van cau
sach ky » sach y, sach ty, sach kem
nang co » nang cao, nang doc, nang noi
co hoi » co hoc, co loi
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, duc va
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ky) or (sac ky)) nang co hoi. thien van cam ((tuc va) or (tuc xa)) hanh di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sac ky)) nang co hoi. thien van cam ((tuc va) OR (tuc xa)) hanh di cua vat.
• Adding a wildcard symbol may retrieve word variants: so ((sach ky) or (sac ky)) nang co hoi. thien van cam ((tuc va) or (tuc xa)) hanh di cua vat*.